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/* DWARF2 frame unwind data structure.
Copyright (C) 1997-2017 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* The result of interpreting the frame unwind info for a frame.
This is all symbolic at this point, as none of the values can
be resolved until the target pc is located. */
typedef struct
{
/* Each register save state can be described in terms of a CFA slot,
another register, or a location expression. */
struct frame_state_reg_info
{
struct {
union {
_Unwind_Word reg;
_Unwind_Sword offset;
const unsigned char *exp;
} loc;
enum {
REG_UNSAVED,
REG_SAVED_OFFSET,
REG_SAVED_REG,
REG_SAVED_EXP,
REG_SAVED_VAL_OFFSET,
REG_SAVED_VAL_EXP,
REG_UNDEFINED
} how;
} reg[__LIBGCC_DWARF_FRAME_REGISTERS__+1];
/* Used to implement DW_CFA_remember_state. */
struct frame_state_reg_info *prev;
/* The CFA can be described in terms of a reg+offset or a
location expression. */
_Unwind_Sword cfa_offset;
_Unwind_Word cfa_reg;
const unsigned char *cfa_exp;
enum {
CFA_UNSET,
CFA_REG_OFFSET,
CFA_EXP
} cfa_how;
} regs;
/* The PC described by the current frame state. */
void *pc;
/* The information we care about from the CIE/FDE. */
_Unwind_Personality_Fn personality;
_Unwind_Sword data_align;
_Unwind_Word code_align;
_Unwind_Word retaddr_column;
unsigned char fde_encoding;
unsigned char lsda_encoding;
unsigned char saw_z;
unsigned char signal_frame;
void *eh_ptr;
} _Unwind_FrameState;
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